syzbot has found a reproducer for the following issue on: HEAD commit: 6a010258447d Merge tag 'for-linus' of git://git.armlinux.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15883fee080000 kernel config: https://syzkaller.appspot.com/x/.config?x=2a1dcc1942e30704 dashboard link: https://syzkaller.appspot.com/bug?extid=942d5390db2d9624ced8 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1568846a080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10f5e536080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+942d5390db2d9624ced8@xxxxxxxxxxxxxxxxxxxxxxxxx executing program BUG: memory leak unreferenced object 0xffff88810f0ac060 (size 32): comm "syz-executor240", pid 3622, jiffies 4294961303 (age 14.040s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff814c6ecd>] __do_krealloc mm/slab_common.c:1185 [inline] [<ffffffff814c6ecd>] krealloc+0x4d/0xb0 mm/slab_common.c:1218 [<ffffffff8162625c>] vfs_getxattr_alloc+0x13c/0x1c0 fs/xattr.c:379 [<ffffffff822374b2>] cap_inode_getsecurity+0xb2/0x500 security/commoncap.c:400 [<ffffffff8223d88c>] security_inode_getsecurity+0x7c/0xb0 security/security.c:1441 [<ffffffff81625a0a>] xattr_getsecurity fs/xattr.c:327 [inline] [<ffffffff81625a0a>] vfs_getxattr+0x22a/0x290 fs/xattr.c:423 [<ffffffff81c0ab02>] ovl_xattr_get+0x62/0xa0 fs/overlayfs/inode.c:404 [<ffffffff81624742>] __vfs_getxattr+0x72/0xa0 fs/xattr.c:401 [<ffffffff82236f52>] cap_inode_need_killpriv+0x22/0x40 security/commoncap.c:301 [<ffffffff8223d773>] security_inode_need_killpriv+0x23/0x60 security/security.c:1419 [<ffffffff8161074e>] dentry_needs_remove_privs fs/inode.c:1992 [inline] [<ffffffff8161074e>] dentry_needs_remove_privs+0x4e/0xa0 fs/inode.c:1982 [<ffffffff815cfead>] do_truncate+0x7d/0x130 fs/open.c:57 [<ffffffff815d0169>] vfs_truncate+0x209/0x240 fs/open.c:111 [<ffffffff815d0268>] do_sys_truncate.part.0+0xc8/0xe0 fs/open.c:134 [<ffffffff815d0303>] do_sys_truncate fs/open.c:128 [inline] [<ffffffff815d0303>] __do_sys_truncate fs/open.c:146 [inline] [<ffffffff815d0303>] __se_sys_truncate fs/open.c:144 [inline] [<ffffffff815d0303>] __x64_sys_truncate+0x33/0x50 fs/open.c:144 [<ffffffff845b1955>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff845b1955>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
